I have the same error from Xcode 12.0 (released version), but the difference is that I have no entries in DVTSourceControlAccountDefaultsKey (instead of multiple).
It worked fine in Xcode 11 (with an initial popup asking for my password), and it also still works fine using the git command line. Any help appreciated, because I do not like having to use Terminal for each git push.
git says it is using osxkeychain as credentials helper, in case that makes any difference.
Taakje
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